#!/usr/bin/env python
#coding=utf-8
#author=xiaomayi0323
#date=2009/02/27
#filename=2-8c

#使用用户输入值和While循环实现计算五个数值的和
a = 0
b = 0

while a< 5:
    b = b + int(raw_input('enter number:'))
    a = a + 1
    
print b
